World Art Nouveau Day is observed worldwide every June 10, celebrating the Art Nouveau movement, an international style of art and architecture that gained popularity in the late 19th and early 20th centuries. The day was first held in 2013, organized by the Museum of Applied Arts in Budapest and Szecessziós Magazin, chosen to coincide with the death anniversary of notable architects Ödön Lechner and Antoni Gaudí. Events on this day include exhibitions, photo contests, lectures, and guided tours aimed at educating the public about Art Nouveau. The celebrations are coordinated by the Barcelona-based Art Nouveau European Route and the Brussels-based Réseau Art Nouveau Network. Each year features a new theme, with past focuses including staircases and stained-glass artwork. The movement is characterized by its natural forms, curving lines, and the use of modern materials, with influences from the Pre-Raphaelites, the Arts and Crafts movement, and Japanese art.